Explanation

A simple island like phosphate mineral with additional anions. When OH>F, it is called hydroxyapatite; When F>OH, it is called fluorapatite. It often contains mixed substances such as Mn, Fe, Y, Na, K, Ba, etc. Hexagonal system, crystal are hexagonal short columnar or thick plate, and aggregates are granular, dense massive or nodular. Pure ones are colorless and white, often dyed in light green, yellow green, brown red, and other colors. Formed in sedimentary rock, containing organic matter and dyed dark gray or black. glass luster, fracture grease luster. phosphorescence after heating. It can be formed under endogenetic, exogenetic and metamorphic conditions, and the endogenetic causes are mostly produced as accessory minerals, sometimes enriched in basic and alkaline rock; Exogenic rocks are formed by biological and biochemical sedimentation, and those in the form of cryptocrystalline blocks or nodules are called collophanite. It is associated with clay mineral, quartze, seridte, etc. apatite in metamorphic rock series is formed by regional metamorphism of sedimentary phosphate rock. It is an important raw mineral material for extracting phosphorus and manufacturing phosphorus fertilizer; fluorapatite crystal can be used as laser materials.

Classification